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pi KAvANAGH. Improvement in Augers.

N0. 131,279. M Patehted Sap-10,1872.

I Tux a PATRICK KAVANAGH, OF CANAR-SIE, NEW YORK.

IMPRQVEMENT IN AUGERS.

Specification forming part of Letters Patent No. 131,52'7%; datedSeptember 10, 1872.

' having a single twist and it consists in a single-twist auger having acenter entering cutting-point, a diagonal cuttinglip extending from thecenter to the circumference of the l auger, and an' uprightcircumferential cuttinglip, as hereinafter described.

In the accompanying drawing, Figure 1 represents a view of the improvedauger-bit. Fig. 2 is an end View enlarged. Fig. 3 is a side viewenlarged, showing the cutting-lip.

Similar letters of reference indicate corresponding parts.

A is the auger. B is the shank. G is the improved cutting-lip. This lipextends from the center of the auger back to the circumference at anangle of about forty-five degrees to the axis of motion, sloping upward,and forming an obtuse angle with and terminating in an uprightcircumferential cutting-lip, D, the edge of which is parallel with theaxis of the auger. E is the center entering and cutting point of the lipG, and the center of the auger. This auger, it will be seen, commencescutting at the center and consequently it does not tear but cuts thegrain of the wood smooth 1y, both in commencing and finishing a hole.

Augers with lips placed at right angles with the axial line tear thewood in commencing and in finishing a hole through apiece of timber;besides, they are more likely to clog and require more power to forcethem through the wood than it does with my iinprot ed lip, constructedwith the center entering and cutting point E.

Having thus described myinvention, Iclaim as new and desire to secure byLetters Patent- A single-twist auger having the center entering andcutting point E, inclined floor-lip O, and upright circumferential lipD, constructed in the manner substantially as de- Witnesses:

JAMES T. GRAHAM, .T. B. Mosnna.

